D-Link DIR-895L A1_102b07 L2TP Control Channel Parser tunnel.c tunnel_set_params out-of-bounds write

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.0$0-$5k1.71+

Summaryinfo

A vulnerability categorized as very critical has been discovered in D-Link DIR-895L A1_102b07. The affected element is the function tunnel_set_params of the file tunnel.c of the component L2TP Control Channel Parser. Executing a manipulation can lead to out-of-bounds write. The identification of this vulnerability is CVE-2026-100740. The attack may be launched remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in D-Link DIR-895L A1_102b07. It has been declared as very critical. This vulnerability affects the function tunnel_set_params of the file tunnel.c of the component L2TP Control Channel Parser. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is available at tzh00203.notion.site. This vulnerability was named CVE-2026-100740. The exploitation appears to be easy. The attack can be initiated remotely. Technical details and also a public exploit are known. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/26/2026).

It is possible to download the exploit at tzh00203.notion.site. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

Vendor

Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.0

VulDB Base Score: 9.9
VulDB Temp Score: 9.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/26/2026 Advisory disclosed
09/26/2026 +0 days VulDB entry created
09/26/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: dlink.com

Advisory: tzh00203.notion.site
Status: Not defined

CVE: CVE-2026-100740 (🔒)
GCVE (CVE): GCVE-0-2026-100740
GCVE (VulDB): GCVE-100-410614
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/26/2026 11:24
Changes: 09/26/2026 11:24 (56)
Complete: 🔍
Submitter: tian
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #906303: D-Link DIR895LA1_102b07 A1_102b07 Out-of-bounds Write (by tian)

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